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Extech 20 Digital Multimeter

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Built-in data-logger stores up to 1,012 readings (single record/continuous data-logging)
4 simultaneous displays of watts, power factor or Na, voltage or Hz, amps
True RMS voltage and current measurements of sine, square, triangular, and distorted wave forms with a crest factor less than 5

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Appliance tester/power analyzer simultaneously displays the wattage, power factor or Va, voltage or frequency (Hz), and current (Amps) of the device or appliance to be tested. The built-in datalogger can store up to 1,012 readings or you can save data directly to your PC using the built-in RS-232 port and included software. Additional features include: max hold, data hold, and overload protection. Battery or AC adapter operation provides line isolation. Comes complete with 8 AA batteries, software, cable, power cord, AC adapter, and case.

Built-in data-logger stores up to 1,012 readings (single record/continuous data-logging)
4 simultaneous displays of watts, power factor or Na, voltage or Hz, amps
True RMS voltage and current measurements of sine, square, triangular, and distorted wave forms with a crest factor less than 5
Plug device to be tested directly into the power analyzer
Maximum, data hold, and overload protection
Battery or AC adapter provides line isolation
Sampling (update) rate is 2.5 times/second
Software included to download and store data to a PC
Complete with Windows compatible software, cable, 8 AA batteries, power cord, 117-VAC adapter, and case